| 초록 |
A decrease in the coefficient of thermal expansion of poly(ether sulfone) film is achieved by the incorporation of hollow doughnut shaped mesoporous silica nanoparticles (hd-MSN). 46.1% and 48.0% decrease in the coefficient of thermal expansion (CTE) of poly(ether sulfone) film are observed in range of 30-90°C and 30-150°C, respectively, when 2.0 wt% of hd-MSNs are loaded. The hd-MSN with large hollow area and mesoporous structure enable the polymer chains to slowly move and fill-in the free volume in the hollow area and the pores and thus restricts the thermal motion. Furthermore, doughnut shape helps to decrease light scattering, so maintaining high transmittance of nanocomposite film. The effect of the hd-MSN was investigated on both the thermal stability and the mechanical stability. We expect the hd-MSN synthesized in this study can be used as a promising filler to improve the thermal and mechanical stability of the PES substrate without losing its optical transparency. |
